Textiles: fiber preparation – Working – Carding
Reexamination Certificate
1999-10-27
2001-09-04
Calvert, John J. (Department: 3765)
Textiles: fiber preparation
Working
Carding
C019S150000, C019S236000
Reexamination Certificate
active
06282755
ABSTRACT:
BACKGROUND
The present invention relates to a process for the feeding of textile fibers to a drafting equipment, as well as to a textile machine with a feeding mechanism.
A method is known from DE-OS 29 11 744 by which a ready reserve sliver is fed to the drafting equipment in case that a presented sliver breaks. In this method, the fiber slivers being fed to the drafting equipment are monitored by means of sensors in the direction of sliver movement in the area before the feed point to ascertain their presence. If a sensor detects that a sliver is missing, the feed mechanism of the reserve sliver is actuated. The reserve sliver is fed in such a manner in that case, that the beginning of the reserve sliver is introduced at the point where a textile fiber sliver is missing due to a breakage or because it has run out. The reserve sliver is laid on a still existing sliver so as to overlap it, and so that it is carried along with said sliver and is fed to the rollers of the drafting equipment. Therefore, it is necessary in order to introduce the fiber sliver into the drafting equipment, that at least one fiber sliver is still present and is connected to the drafting equipment or has already been seized by the draw-in rollers.
DE 197 21 758 A1 discloses a device on a carding machine, on which a nap funnel is installed with draw-off rollers at the output of the carding machine. Between the nap funnel and the sliver intake opening of the depositing plate, drafting equipment is installed. The fiber sliver is drawn off by the draw-off rollers after the nap funnel. The fiber sliver runs via a deflection roller to a sliver funnel which is located before the drafting equipment.
The devices shown in the state of the art have the disadvantage that either a sliver must still be present so that an introduction of the fiber sliver newly to be introduced is possible, or that the fiber sliver can be introduced into the drafting equipment only by hand.
SUMMARY
It is a principal object of the present invention to propose a process for the feeding of textile fibers to a drafting equipment which avoids the disadvantages of the state of the art, as well as a textile machine with a feed mechanism for the feeding of a fiber sliver delivered from a delivery point which facilitates or simplifies the introduction of a fiber sliver into a drafting equipment considerably. Additional objects and advantages of the invention are set forth in the following description, or may be obvious from the description, or may be learned through practice of the invention.
The process according to the invention for the feeding of textile fibers to a drafting equipment may be characterized in that the fibers presented by the point of delivery are formed into a fiber sliver and are then conveyed in form of the fiber sliver to a drafting equipment which carries out continued processing of the fiber sliver, whereby the fibers are conveyed by a feed mechanism at least in the area before the drafting equipment and are introduced by said feed mechanism into the drafting equipment. The process makes it advantageously possible to considerably facilitate the handling of the textile fibers or of a fiber sliver composed thereof on a textile machine. It is thus advantageously possible to design the introduction of the fiber sliver into the drafting equipment in a much more effective manner and to also accelerate this considerably in time. This is especially advantageous when the delivery speed on the textile machine is high and cannot be lowered at will, so that a manual handling does not make it possible to introduce the fibers into the drafting equipment at the required speed. The process according to the invention thus makes it possible on textile machines on which the feeding speed cannot be lowered or cannot be lowered significantly to achieve nevertheless satisfactory and sufficiently rapid transfer of the fibers or of a fiber sliver consisting thereof to a drafting device or drafting equipment. This ensures a secure interconnection of the components of the textile machine even when difficult problems are to be solved. In particular the area before the drafting equipment presents an especially difficult point for the handling of the fibers or of the fiber sliver, since the drafting rollers are for the most part already closed and the draw-in roller of the drafting equipment already rotates so that the introduction of a fiber sliver requires special skill and at the same time represents a dangerous spot since, in the worst scenario, the rotating rollers of the drafting equipment may cause injuries. Thanks to the process according to the invention, the especially difficult part of the fiber feeding process is taken over by a device which is able to work faster than an operator and at the same time secure introduction of the fibers into the drafting equipment is made possible without any risk of injury to an operator. The area before the drafting equipment which is provided with a feed mechanism according to the process of the invention is in particular the area between the drafting equipment and a deflection point of the fiber sliver upstream of it, in direction of sliver movement or some other device, e.g. a pair of scanning rollers which scans the fiber sliver to measure its condition in a regulated draw fame. According to the invention, the beginning of the conveyor of the fiber sliver is provided following such a location, whereby a sufficient distance remains between this “interference point” and the beginning of the conveyor in an especially advantageous embodiment so that an operator or an automatic service device, e.g. with an automatic grasper on a robot arm, can still grasp the fiber sliver and transfer it to the feed mechanism. At the same time, it is also possible with the process according to the invention for the fiber sliver to be taken or conveyed by the conveyor over one or several so-called interference points in the path of the fiber sliver. For this purpose several feed mechanisms, e.g. in a row one after the other, can be used advantageously according to the invention, or the device may be provided with several of them. It is especially advantageous for at least two thereof to be provided with their own drives. According to the invention, the feed mechanism should be able to introduce the fiber sliver into the drafting equipment. The length of time during which the fiber sliver is conveyed already before by the feed mechanism is unimportant for the basic idea of the present invention.
In order to facilitate the feeding of the fibers, it is especially advantageous to form the fibers delivered from the delivery point first into a fiber sliver without rotating them. This can be provided advantageously directly after the delivery point of the textile fibers. The utilization of a nap funnel for this purpose is especially advantage, this funnel being able to form the delivered fibers into a fiber sliver as e.g. in carding machines. The fiber sliver formed by the nap funnel is drawn off from the nap funnel especially advantageously by means of conveyor rollers.
In another advantageous process, the delivered fibers or the formed fiber sliver is transferred in a controlled manner to the feed mechanism, whereby this operation can advantageously be carried out by hand or, depending on the other design features of the textile machine, by a transfer device which transfers the fibers or the fiber sliver to the feed mechanism. This can be effected advantageously by the grasper of a robot. The controlled transfer makes it advantageously possible to achieve reliable and rapid transfer of the fiber sliver to the conveyor. In another advantageous embodiment of the process according to the invention, the feeding speed of the fiber sliver is lowered below the normal operating speed of the textile machine in order to facilitate the handling or introduction into the drafting equipment, and also the introduction of the fiber sliver into the feed mechanism. For this purpose, the speed of the fiber sliver is lowered especially advantage
Brunner Armin
Strobel Michael
Weisigk Lars
Calvert John J.
Dority & Manning
Rieter Ingolstadt Spinnereimaschinenbau AG
Welch Gary L.
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